The website is serving as an online modeling agency. They do promotions and create links. So I would assume that the $1,000 is their commission. You may want to review the terms and conditions that you agreed to in posting your profile on their site. All the best of luck!
Without looking at the agreement between you and the website, we can't really say.
This answer is informational only and does not create an attorney client relationship. I am not expressing an opinion on the merits of your case based on the facts above. This is not legal advice. This is free. You pay for legal advice.